Locomotive structure



Get. 29, 1935- J. c. TRAVILLA, JR

LOCOMOTIVE STRUCTURE 2 Sheets-Sheet 1 Filed Feb. 27, 1932 favzzz/or Jam as C 7Faw7/a-ln 19 f/orm z g.

Get. 29, 1935. J. c. TRAVILLA, JR

LOCOMOTIVE STRUCTURE 2 Sheets-Sheet 2 Filed Feb. 27, 1932 Patented Oct. 29, 1935 Nr orrlcs LOCOMOTIVE STRUCTURE Application February 2'7, 1932, Serial No. 595,582

10 Claims.

This invention relates to steam locomotives and consists in the provision of a structure whereby the framing will not be seriously damaged by forces created by expansion and contraction of the frame parts due to the passage of steam through and adjacent to the same.

In the usual steam locomotive construction, the main steam cylinders and the steam control valves are supported on transverse members extending sidewardly of the locomotive main frame, and the exhaust steam passageways leading from the cylinders and control valve chambers pass substantially horizontally or upwardly through the sides of the frame and into the lower portion of the smoke box, from whence they are exhausted through the stack. The cylinders may be secured to the main frame by bolts, or may be cast integral with the main frame. In either case the steam passageways are frequently heated to a temperature so different from the remaining parts of the associated structure that the resulting expansion and contraction stresses tend to loosen the cylinder securing bolts, to create strains in the frame and to throw the axes of the cylinders and control valves out of line.

The main objects of the present invention are to avoid the above disadvantages and to provide more secure mounting for the cylinders than is the case in previous structures. These objects and others are attained by the structures illustrated in the accompanying drawings, in which Figure 1 is in part a top view of a locomotive frame and steam cylinder structure, and in part is a horizontal section taken on a line ll of Figure 2.

Figure 2 is a vertical transverse section taken on a line 2-2 of Figure 1.

Figure 3 is a bottom view of a part of the structure shown in Figure 2.

Figures 4 and 5 are vertical longitudinal sections taken on lines 4-4 and 5-5 of Figure 2, respectively.

The main steam cylinders I and steam supply valve chambers 2 are shown cast integrally with each other and with the locomotive bed or frame which includes a box-like structure having a top wall 3, a bottom wall 4, side walls 5, which converge abreast the cylinder saddle, and supplementary side walls 6 spaced outwardly from walls 5. The supplementary side walls 6 do not extend through the cylinder saddle but curve outwardly, as indicated at l, to merge with the ends of the cylinders.

Exhaust steam passageways 8 lead from the ends of each valve chamber 2 inwardly and downwardly through the sides of the frame and then turn upwardly, as at 9, to form the lower portion ID of a discharge nozzle from which the exhaust steam passes to the stack (not shown). The lower walls of steam passageways 8 merge with '5 the side walls of cylinders I and also merge with the lower wall 4 of the frame whereby this member of the bed adjacent to the cylinders is heated by the exhaust steam to substantially the same extent as the exhaust passageways and this tends 10 to equalize the expansion in all of the associated structure.

Surrounding nozzle l 0 and extending above the main portion of the underframe is a smoke box saddle including sloping side walls l2 and I3 and transverse front and rear walls l5 and I6 forming continuations of walls l4 and [8. A smoke box mounting flange H extends entirely around the top of the saddle. Inclined walls I2 and I3 extend downwardly and outwardly beneath the top web 3 of the underframe and merge with cylinders I between the exhaust passages 8. The cylinders are thus more solidly supported than in other types of cylinder saddles, in which these members are mounted upon transverse supports extending horizontally beyond the side walls of the underframe. A horizontal web I! traverses the upper part of the saddle and braces the walls thereof and elongated nozzle I 0.

A center plate structure 25 depends from lower 3 wall 4 in the center of the saddle and this is reinforced by longitudinal and transverse ribs l9 and 20, respectively, extending between frame side walls 5 and stretcher walls It and I8 which form a box within the saddle. Transverse ribs 20 curve outwardly at the center conforming, in general, with the outline of the center plate structure, and longitudinal ribs I9 extend above ribs 20; merging with and supporting the undersides of passages 8.

Since the passageways leading from chambers on opposite sides of the locomotive merge with each other, the deep curving of the inner parts of the passageways adjacent to their merged portions helps to relieve stresses which might otherwise be created therein and which might otherwise exist in the stretcher walls l4 and it which help to transmit the cylinder load to the central framing structure.

An additional advantage in this structure is that the discharge passage for the exhauststeam extends to a lower level than usual and the steam travels a greater distance in a straight line immediately before leaving the exhaust nozzle than is the case in the usual type of construction.

The exhaust nozzles may be shaped as described in a locomotive saddle structure which is formed separately from and applied to the 10- comotive side frames, and similarly the main features described may be embodied in a structure utilizing separate cylinders bolted to the sides of the saddle or to the sides of the locomotive frame. The exclusive use of these modifications of the invention and other variations in detailed structure is contemplated wherever there is utilized the spirit of the invention as expressed in the claims.

What is claimed is:

1. In a locomotive saddle construction, a main steam cylinder, a hollow body element forming a part of a longitudinal framing member and including a bottom wall below the level of the top of said cylinder, and exhaust steam passageways leading from above the top of said cylinder inwardly and downwardly and merging with said bottom wall so as to expose the latter directly to the heat of exhaust steam and then forming a substantially vertical discharge nozzle extending upwardly from a level below the top of said cylinder.

2. In combination, a locomotive bed of box cross section, steam cylinders carried thereby, and exhaust steam passageways leading inwardly and downwardly through the sides of said bed and meeting the bottom thereof and then turning upwardly and discharging through the top of said bed.

3. In combination, a locomotive bed of box cross section, steam cylinders carried thereby, and exhaust steam passageways leading inwardly and downwardly through the sides of said bed with the lower walls of said passageways merging with the lower walls of said bed, said passageways then merging and extending upwardly to form a discharge nozzle extending through the top of said bed.

4. In combination, locomotive main steam cylinders, a box-like framing structure between said cylinders, steam control valve chambers above said cylinders, exhaust steam passageways leading from said chambers inwardly and downwardly through the sides of and to the bottom of said structure and then turning upwardly and forming a discharge nozzle leading through the top of said structure, all of said parts comprising an integral cast metal device.

5. In combination, a locomotive main frame structure of box-like cross section, a steam supply valve chamber at the side of and substantially above the level of said main frame structure, and an exhaust steam passageway leading from said chamber inwardly and downwardly through the lower portion of the side of said structure and meeting the bottom thereof and then extending upwardly through the top of said structure.

6. In combination, locomotive main steam cylinders,atransverse web connecting the inner walls of said cylinders and constituting the bottom of a locomotive frame member, steam control valve chambers above said cylinders, exhaust steam passageways leading from said chambers inwardly and downwardly and merging with each other and with said web to cooperate therewith to support said cylinders and chambers.

7. In a locomotive cylinder saddle, main steam cylinders, a transverse web between the same, a center plate structure on said web, exhaust steam passageways extending from above said cylinders downwardly and inwardly to a level adjacent said web, and upright reinforcing ribs traversing said structure and supporting said passageways.

8. In combination, locomotive main steam cylinders, steam supply valve chambers above the same, a transverse web connecting said cylinders, a center plate on the central bottom portion of said web, exhaust passageways leading from said chambers inwardly and downwardly with their lower walls merging with said web at the sides of said central bottom portion and then inclined inwardly and upwardly and merging with each other, and reinforcing ribs between said central bottom portion and said inwardly and upwardly inclined parts of said passageways.

9. In combination, a substantially box section locomotive boiler saddle structure having side and end walls and boiler mounting flanges at the top, main steam cylinders and valve chambers at the sides of said structure, and exhaust passages extending downwardly and inwardly from said chambers and merging with said cylinders, said side walls extending downwardly and outwardly from said flanges and merging with said cylinders between said passages.

10. A construction as specified in claim 9 comprising an integral cast metal unit.

JAMES C. TRAVILLA, JR. 

